Originally published in Great Britain by Penguin Random House Children's in 2018 Originally published in Great Britain by Caterpillar Books Ltd in 2020 Originally published in Great Britain in 2004 by Macmillan Children's Books Originally published in Great Britain and the USA in 2007 Originally published in Great Britain by Templar Publishing, 2002. Originally published in hardcover by Random House Children's Books in 2007 Originally published in hardcover: New York : Random House Children's Books, 2010 Originally published in Great Briatin by William Collins Sons in 1974. Originally published in Great Britain in 2015 by Frances Lincoln Chidlren's Books Originally published as Polar babies by Random House Children's Books, 2000.